//------------------------------------------------------------------------------
// <copyright file="NativeMethods.cs" company="Microsoft">
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
// <owner current="true" primary="true">markash</owner>
// <owner current="true" primary="false">blained</owner>
// <owner current="true" primary="false">mithomas</owner>
//------------------------------------------------------------------------------

using System;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;

namespace System.Data.Common {

    internal static class NativeMethods {

#if !NO_OLEDB
        [Guid("0c733a1e-2a1c-11ce-ade5-00aa0044773d"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown), ComImport]
        internal interface ISourcesRowset {

            [PreserveSig] System.Data.OleDb.OleDbHResult GetSourcesRowset(
                [In] IntPtr pUnkOuter,
                [In, MarshalAs(UnmanagedType.LPStruct)] Guid riid,
                [In] int cPropertySets,
                [In] IntPtr rgProperties,
                [Out, MarshalAs(UnmanagedType.Interface)] out object ppRowset);
        }
#endif

        [Guid("0C733A5E-2A1C-11CE-ADE5-00AA0044773D"), InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown), ComImport]
        internal interface ITransactionJoin {
            [ Obsolete("not used", true)] [PreserveSig] int GetOptionsObject(
                /*deleted parameter signature*/);

            void JoinTransaction(
                [In, MarshalAs(UnmanagedType.Interface)] object punkTransactionCoord,
                [In] Int32 isoLevel,
                [In] Int32 isoFlags,
                [In] IntPtr pOtherOptions);
        }
        
        [DllImport(ExternDll.Kernel32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.Machine)]
        static internal extern IntPtr MapViewOfFile(IntPtr hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh, int dwFileOffsetLow, IntPtr dwNumberOfBytesToMap);

        // OpenFileMappingA contains a security venerability, in the unicode->ansi conversion 
        // Its possible to spoof the directory and construct ../ sequeences,  See FxCop Warrning
        // Specify marshaling for pinvoke string arguments
        [DllImport(ExternDll.Kernel32, CharSet=System.Runtime.InteropServices.CharSet.Ansi, BestFitMapping=false, ThrowOnUnmappableChar=true)]
//        [DllImport(ExternDll.Kernel32, CharSet=System.Runtime.InteropServices.CharSet.Ansi)]
        [ResourceExposure(ResourceScope.Machine)]
        static internal extern IntPtr OpenFileMappingA(int dwDesiredAccess, bool bInheritHandle, [MarshalAs(UnmanagedType.LPStr)] string lpName);

        // CreateFileMappingA contains a security venerability, in the unicode->ansi conversion 
        // Its possible to spoof the directory and construct ../ sequeences,  See FxCop Warrning
        // Specify marshaling for pinvoke string arguments        
        [DllImport(ExternDll.Kernel32, CharSet=System.Runtime.InteropServices.CharSet.Ansi,  BestFitMapping=false, ThrowOnUnmappableChar=true)]
//        [DllImport(ExternDll.Kernel32, CharSet=System.Runtime.InteropServices.CharSet.Ansi)]
        [ResourceExposure(ResourceScope.Machine)]
        static internal extern IntPtr CreateFileMappingA(IntPtr hFile, IntPtr pAttr, int flProtect, int dwMaximumSizeHigh, int dwMaximumSizeLow, [MarshalAs(UnmanagedType.LPStr)] string lpName);

        [DllImport(ExternDll.Kernel32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        [ResourceExposure(ResourceScope.Machine)]
        static internal extern bool UnmapViewOfFile(IntPtr lpBaseAddress);

        [DllImport(ExternDll.Kernel32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.Machine)]
        static internal extern bool CloseHandle(IntPtr handle);

        [DllImport(ExternDll.Advapi32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        static internal extern bool  AllocateAndInitializeSid(
            IntPtr pIdentifierAuthority, // authority
            byte nSubAuthorityCount,                        // count of subauthorities
            int dwSubAuthority0,                          // subauthority 0
            int dwSubAuthority1,                          // subauthority 1
            int dwSubAuthority2,                          // subauthority 2
            int dwSubAuthority3,                          // subauthority 3
            int dwSubAuthority4,                          // subauthority 4
            int dwSubAuthority5,                          // subauthority 5
            int dwSubAuthority6,                          // subauthority 6
            int dwSubAuthority7,                          // subauthority 7
            ref IntPtr  pSid );                                   // SID

                      
        [DllImport(ExternDll.Advapi32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        static internal extern int GetLengthSid(
            IntPtr pSid);   // SID to query

        [DllImport(ExternDll.Advapi32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        static internal extern bool InitializeAcl(
            IntPtr pAcl,            // ACL
            int nAclLength,     // size of ACL
            int dwAclRevision );  // revision level of ACL

        [DllImport(ExternDll.Advapi32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        static internal extern bool AddAccessDeniedAce(
            IntPtr pAcl,            // access control list
            int dwAceRevision,  // ACL revision level
            int AccessMask,     // access mask
            IntPtr pSid  );           // security identifier

        [DllImport(ExternDll.Advapi32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        static internal extern bool AddAccessAllowedAce(
            IntPtr pAcl,            // access control list
            int dwAceRevision,  // ACL revision level
            uint AccessMask,     // access mask
            IntPtr pSid  );           // security identifier
                    
        [DllImport(ExternDll.Advapi32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        static internal extern bool InitializeSecurityDescriptor(
            IntPtr pSecurityDescriptor, // SD
            int dwRevision );                         // revision level
        [DllImport(ExternDll.Advapi32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        static internal extern bool SetSecurityDescriptorDacl(
            IntPtr pSecurityDescriptor, // SD
            bool bDaclPresent,                        // DACL presence
            IntPtr pDacl,                               // DACL
            bool bDaclDefaulted);                       // default DACL

        [DllImport(ExternDll.Advapi32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        static internal extern IntPtr FreeSid(
            IntPtr pSid);   // SID to free
    }
}